I hope the genre of physics-based games on the web never dies, because they're just too damn fun. Color Infection is just such a game, where the object is to "infect" all of the yellow balls by turning them brown. Yellow balls are turned brown when they come in contact with brown balls, so the object of the game is to release the balls in such an order that every yellow ball is at some point touched by a brown ball.

Because much of the game relies on balls slowly rolling down slightly inclined planes, the game can become very slow. Luckily, the game designer anticipated that problem, and if you tap one of the number keys on your keyboard while you are playing, the game speed will multiply by the number you pressed. I found the game to be mostly playable at 5x regular speed, but there are moments requiring very careful timing where I had to slow it down to 2x or even 1x.